The Collaborative International Dictionary of English v.0.48:

pacifying \pacifying\ adj.
   freeing from fear and anxiety.

   Syn: assuasive, calming, soothing.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Pacify \Pac"i*fy\, v. t. [imp. & p. p. Pacified; p. pr. & vb.
   n. Pacifying.] [F. pacifier, L. pacificare; pax, pacis,
   peace + -ficare (in comp.) to make. See Peace, and -fy.]
   To make to be at peace; to appease; to calm; to still; to
   quiet; to allay the agitation, excitement, or resentment of;
   to tranquillize; as, to pacify a man when angry; to pacify
   pride, appetite, or importunity. "Pray ye, pacify yourself."
   --Shak.

   Syn: lenify, assuage, appease, mollify, placate, gentle,
        gruntle.
        [1913 Webster + WordNet 1.5]

              To pacify and settle those countries. --Bacon.
        [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "pacifying":
   appeasing, calming, conciliatory, cradling, dreamy, drowsy,
   gentling, hushing, irenic, lulling, mollifying, pacific,
   pacificatory, placative, placatory, propitiative, propitiatory,
   quietening, reconciliatory, restful, rocking, soothful, soothing,
   stilling, tranquilizing